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To allow for flexion, the __________ unlocks the knee joint.

Answer :

Final answer:

The popliteus muscle in the posterior leg enables flexion in the knee joint by 'unlocking' it through a lateral rotation of the femur. This unlocking moves away from the slight medial rotation that occurs when the knee is fully extended. The medial and lateral tibiofemoral joints facilitate this motion.

Explanation:

The popliteus muscle, located in the posterior leg, is primarily responsible for initiating flexion movement of knee joint, often referred to as the unlocking mechanism. The knee joint is positioned between the articulations of the tibiofemoral joints - the medial and lateral tibiofemoral joints which are the links between the condyles of the femur and those of the tibia. These joints allow the knee to perform extension and flexion movements. The condyles of the femur roll and glide over the surface of the tibia during these movements.

Slight medial rotation of the femur happens when the knee comes to full extension, serving to "lock" the knee in its most stable position. The lateral rotation of the femur, often instigated by the popliteus muscle, "unlocks" the knee and initiates knee flexion. A degree of leg rotation is also viable when the knee is flexed.

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